I think the mystery books go fast because I literally become Adriana Hofstetter and she is an impatient girl who wants answers and wants to know what's going on in the quickest way possible. So, I'm in that mindset when I'm writing and it just comes pouring out. With the non-fiction, I was literally petrified I'd start forgetting things and I just wanted to get it all down as quickly as possible and I just could not stop writing - sometimes to the tune of twenty pages a day.